Axis 282 Uživatelský manuál stáhnout pdf (Strana 34)

Chapter II-12 — Graphs

II-266

Axis Tab

You can set the axis Mode for the selected axis to linear, log base 10, log base 2, or Date/Time. The Date/Time

mode is special — when drawing an axis, Igor looks at the controlling wave’s units to decide if it should be

a date/time axis. Consequently, if you select Date/Time axis, the dialog immediately changes the units of

the controlling wave. Because the dialog changes the wave’s units, there is a small warning message next

to the Date/Time radio button. See Date/Time Axes on page II-278 for details on how date/time axes work.

The Axis area of the Axis tab controls certain aspects of the axis layout:

Use the Mirror Axis pop-up menu to enable the mirror axis feature. A mirror axis is an axis that is the mirror

image of the opposite axis. You can mirror the left axis to the right or the bottom axis to the top. The normal

state is Off in which case there is no mirror axis. If you choose On from the pop-up, you get a mirror axis with

tick marks but no tick mark labels. If you choose “No ticks”, you get a mirror axis with no tick marks. If you

choose Labels you get a mirror axis with tick marks and tick mark labels. Mirror axes may not do exactly what

you want when using free axes, or when you shorten an axis using Draw Between. An embedded graph may

be a better solution if free axes don’t do what you need; see Chapter III-4, Embedding and Subwindows.

Free axes can also have mirror axes. Unlike the free axis itself, the mirror for a given free axis can not be

moved — it is always attached to the opposite side of the plot area. This feature can create stacked plots;

see Creating Stacked Plots on page II-295.

The “Draw between” items are used to create stacked graphs. You will usually leave these at 0 and 100%,

which draws the axis along the entire length or width of the plot area. You could use 50% and 100% to draw

the left axis over only the top half of the plot area (mirror axes are on in this example to indicate the plot area):

For additional examples of using “Draw between”, see Creating Stacked Plots on page II-295 and Creating

Split Axes on page II-301.

Tick Options More obscure settings for tick appearance.

Axis Label Create or change the axis label. See Axis Labels on page II-282.

Label Options Settings that affect appearance of axis and tick mark labels, such as rotation and

position relative to the axis. See Label Options Tab on page II-272.

Axis Range Settings that affect the range of the axis. See Setting the Range of an Axis on page II-245.

Tab What It Does

Limits axis to a subset of its normal size. Used to create stacked graphs

and inset graphs. There is no interactive way to set these values.

Value is in fractional points (72 per inch). Also sets the tick

thickness which you can override in the Ticks and Grids tab.

Used only for Category Axes. See Bar and Category Gaps on page II-315.

Moves axis in or out relative to its automatic position. Normally adjusted by

interactively dragging the axis.

Useful for fill-to-zero trace mode, which can cover the axis.

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